Yan Qi walked towards Yan Zike, came to him and said, "I have an idea. ”

He leaned down, made a deferential look, and looked at her seriously: "Say." ”

"I thought of a way to burn a handkerchief without ashes. Yan Qidao, "However, I don't know if I can make the materials that need to be used." ”

"Let's give it a try. Yan Zike said without doubt.

What Yanqi needs is concentrated sulfuric acid and concentrated nitric acid.

Sulfuric acid has been successfully manufactured by the ancients in the official history, using green alum as a raw material, calcining in a distillation kettle to produce sulfuric acid, the ancients called it "green alum oil" , and nitric acid, although there is no record of the ancients making nitric acid in the official history, but fortunately, although Yan Qi was not a scholar in that life, he was also honest and rote memorized the knowledge of various subjects, at least she still remembered that calcination of potassium nitrate in a closed container can produce nitrogen dioxide, nitrogen dioxide dissolved in water, it becomes nitric acid, and the saltpeter produced by saltpeter mines in ancient China is potassium nitrate.

Under Yan Zike's instructions and Qiao Lezi's assigned manpower, the preparation of concentrated sulfuric acid and concentrated nitric acid was quickly prepared, coupled with the help of Cui Xi, a "handmade" genius, it only took half an afternoon for the two things to be perfectly manufactured.

Next is the method provided by Yan Qi by memory, the male classmate who changed the magic was interested in having a good relationship with Yan Qi because he wanted to pursue the girl at Yan Qi's front table, and he told Yan Qi the technique of changing this magic trick in the small talk.

First of all, prepare two halves of water, one for cold water and the other for warm water. Pour concentrated nitric acid into the anti-corrosion cup first, then pour the concentrated sulfuric acid in, gently stir with a glass rod, then you need to use a thermometer to measure the temperature of the mixed acid, if it is higher than 30C, you need to soak the cup in the cold water tank, if it is lower than 30C, you need to immerse the cup in the warm water tank, in short, to make the temperature of the mixed acid reach about 30C.

However, the ancients did not have a thermometer, and this temperature had to be mastered by the feeling of the practitioner Cui Xi, and Yan Qi could only tell him that the temperature was lower than the temperature of the human body.

The next step is to soak the handkerchief, specially found with the same material as Xu Yujie's clothes, is poplin texture, poplin commonly used raw materials are cotton and yarn, and nitrified cotton fiber, with a high degree of flammability, can cause spontaneous combustion when the temperature exceeds 40C.

The handkerchief is soaked evenly in a cup filled with mixed acid for about a quarter of time, fished out with a glass stick, and then soaked in clean water and rinsed repeatedly to remove the acid, and after drying, a flammable handkerchief that does not produce ash after burning is made.

Such a cloth is not easy to preserve, and usually needs to be immersed in water and placed in a corrosion-proof container for closed storage.

In that life, such a thing belonged to the most common magic props, and when ignited, the fire was large, the burning speed was fast, and there were no ashes after burning, and the scene was very dazzling.

Cui Xi has failed many times in the process of solution temperature, after all, it is very difficult to find the standard of 30 degrees without a thermometer, but this person seems to be a rare "handmade" genius in a century, and his sense and mastery of various details are simply amazing, so in half an afternoon, he succeeded.

After drying, Yuan Chang was responsible for holding one hand and using the other hand to light the fire fold, and everyone collectively witnessed the miracle of the cloth burning without ashes. And the important thing is that this fire, this burning speed, and this burning state are exactly the same as when Xu Yujie's clothes were burning!

"Nitrate, I specialize in the northwest. If the southeast dealer refuses to be officially introduced, he will be guilty of smuggling goods. Qiao Lezi's eyes lit up, "I am very strict with the management of those who carry and sell nitrate, and all the records in the yamen are recorded, and the people who come will return to the yamen immediately and copy the list of all the nitrate holders in the capital to this government!"

Qiao Lezi turned his head and flipped through the confessions of the students of the two academies, took out a copy of it, and said: "In the Dance Club of Jiyue Academy, the person who is responsible for keeping the contestants' clothes is called Xing Zhuluo, and this person is suspected of serious dà!

So someone immediately went to take the suspect, and the rest of the people vacated the compartment on the painting boat and arranged it as an interrogation room, and Mr. He, who had been hiding inside, had to give way to the place, just when the second girl Yan saw that the case was going to be tried on the boat, and knew that it was inconvenient to stay longer, so she asked Yan Zike to take the government's boat back to the shore, so Mr. He took a boat with her and left with his family.

Several other children in the Yan family didn't want to stay longer, so they took people to leave, but Yan Zike pointed a little at Yan Qi: "Xiao Qi stays." ”

Yan Qi provided this unbelievable method, naturally he wanted to stay as a witness, Yan Qi left Wu Yue to stay, and then Cui Xi and Yuan Chang both stayed together, and the painting boat was empty again in an instant.

"Yan Xiaopang, where did you know this method?" Yuan Chang asked by grabbing Yan Qi's arm.

"It looks like it in the miscellaneous books. "Yan Qidao.

"What book?" Cui Xi was most interested in this.

"When I used to go shopping, I looked at the second-hand book stall a few times, and I forgot what the book was. Yan Qi lied reasonably, looked at Cui Xi, and added another sentence in order to prevent him from continuing to ask, "Later, I heard that the old man who sold books was sick and died." ”

"Huh. Cui Xi really didn't ask again.

"So that's the way it is!" Wu Yue gestured, "Someone moved on Xu Yujie's clothes, and used that convex lens to shine on her clothes while she was dancing in public, and then the clothes were set on fire, the strange thing is why she used this method? If you want to kill Xu Yujie, you can make the fire burn for a longer time, but Xu Yujie is not in a big problem except for a few burns on her body." ”

"Isn't it?" Cui Xi smiled, "Isn't it more embarrassing and painful for her to burn her and make her naked in front of so many people?" And in fact, you have also seen that Xu Yujie has such a thing, she can't live anymore, and the only thing waiting for her is death, either self-judgment, or being executed by the clan or family, the suspect did not kill her with his own hands, but the same achieved the purpose of her life, it can be seen that the purpose of this suspect is not only to let her die, but also to fully humiliate her before she dies, and the suspect has a very deep hatred for Xu Yujie. ”

"That's right. "Yan Qidao.

"What are you coaxing!" Yuan Chang was dissatisfied with Yan Qi and Cui Xi singing and harmonizing, and glared at her, "You sue me, how did the suspect know that such a method can burn Xu Yujie's clothes?

That's right.

This requires the use of more precise chemical methods, how could an ancient person use it?

Could it be that there are fellow countrymen in this era?

If that's the case, should you be happy or nervous?

In case of a careerist who vainly tries to dominate the rivers and lakes and unify the Central Plains, will his first reaction be to eradicate her, a guy who knows the bottom line, first?

If they reveal our origins, will I be burned to death as a heterogeneous bundle?

So if it's really a fellow countryman, do you want to recognize him?

"What's the point? Yan Qi replied to what Yuan Chang said just now, and then walked to the cubicle that was used as an interrogation room, Xing Zhuluo had not been brought over, only Qiao Lezi, Yan Zike and a master in charge of making notes were in the cubicle.

"Miss Seven, what's wrong?" Qiao Lezi saw Yan Qi coming in, thinking that there was some problem or new discovery in Fang Cai's method.

"I want to sit in on it. Yan Qi said bluntly.

"Come and sit here. Yan Zike beckoned her over and sat down on the chair beside him.

Qiao Lezi: "...... "What's the matter—is this child's play?! How justified is this fat girl's words? it! Yan Zike, you're enough! How can you let a child sit in on the trial? Is this a special play?

Before the groove in my heart was finished, I saw someone knocking on the door, and it was Wu Yue, Cui Xi and Yuan Chang who came out: "We want to ......"

"No!" Qiao Lezi flipped the table, "Ask the case here! Go out and play!"

Xing Zhuluo was brought in, Yan Qi sneezed and uttered the tone of "timetravelers", and Xing Zhuluo didn't have the slightest reaction as a fellow countryman except for a confused look at her.

Not her? Or is she not?

Yan Zike tilted his head and asked, "What are you talking about?"

"Sneezing in a pattern, the academy has been fashionable lately. "Yan Qidao.

"Oh. Yan Zike sat up straight and didn't ask any more questions.

"Are all the dance costumes, including the matching underwear and outerwear, from the completion of the production to the time of today's competition, to be kept by you?" Qiao Lezi asked directly after Xing Zhuluo finished the ceremony.

"Back to my lord's words, yes. Xing Zhuluo lowered her head, unable to see the expression on her face, and her tone was flustered and calm, much like the normal reaction of an unrelated person.

"Where are the dance costumes kept?" Qiao Lezi continued.

"In the closet of the academy dance club, the lock is locked, and I hold the key. Xing Zhuluo said.

"What do you do in the dance club?"

"Logistics. ”

Yan Qiyi shuddered, the word logistics...... It's really trance-like.

"Who else but you can open the cupboard where the dance clothes are stored?" Qiao Lezi asked.

"There is no one else, there is only one key......" Xing Zhuluo seemed to be nervous.

Asked about this, unless Xing Zhuluo is particularly confident in her modus operandi, if she is really a suspect, she can shirk her responsibility, such as pretending that other people have used dance clothes and so on, so it seems that it is very likely that the suspect is not her, so she said it and did not shirk.

In the absence of any empirical evidence for the time being, Qiao Lezi had nothing to ask, so he ordered the officials to take Xing Zhuluo to the next compartment to guard him first, and then waited for the reply from the officials who had been sent out to verify before.

Qiao Lezi's men moved very quickly, and after an hour, they all checked what should have been checked, and they came back to recover their lives with the results, but whether it was a glass workshop or a firm that sold nitrate, there was no record of convex lens customization and individual purchase of nitrate in all the sales records.

"Isn't this method used by the suspect at all?" Qiao Lezi hesitated.

"This method is incredible, and I don't believe that there are more ways to burn the cloth without ash. Yan Zike said, "Let people check, Xing Zhuluo's recent behavior, whether he has contact with outsiders, where he has been, and what things he has bought, all of them are carefully investigated, and then check the jewelry shop, someone can order crystal or glass jewelry in the near future." ”

Qiao Lezi was busy responding, and immediately passed on the words.

The next thing was still waiting, Xu Yujie's family received a notice and rushed to the painting boat, because the case was not yet closed, it was not easy to take people away, so Mrs. Xu had to go to the cubicle to comfort her daughter who had woken up, and the rest of the people stayed outside to continue grinding time.

Yan Zike took Yan Qi to the window away from everyone, let her sit in front of her and asked, "Where did you know that method?"

Yan Qi still used the excuse of prevaricating Yuan Chang and them.

"Didn't lie to me?" Yan Zike was not easy to deceive, and a pair of cool and clear eyes stared into Yan Qi's eyes.

"Nope. Of course, Yan Qi was not a child, so he met the man's gaze with confidence.

"This method is complicated and weird, and it is far from the point that everyone knows it all over the street," Yan Zike looked at Yan Qi and said slowly, "And I believe that there are no more than three people in the world who know and can apply this method now." You and Cui Xi are counted as one of them, the suspect in this case is considered the second, and the person who created this law is the third. At the time of the incident, the people on the two painting boats were female gentlemen except for female students, and if the scope was narrowed down a bit, ninety percent of the suspects may be among these people in Jiyue Academy. They are all teenage girls, I don't believe that any of them can create such a method on their own, nitrate is a thing that the imperial court strictly restricts the sale, and the women in the boudoir have nothing to do on weekdays, who will buy these dangerous things to play with for no reason? Therefore, it can be considered that no matter which of these girls is the suspect, she will never be the creator of this method, and the real creator of the zào must also be an accomplice who taught her this method and made her use to harm others. An'an, tell me where you got this method? ”

Yan Qi looked at him, what he meant was that there was only one person who could create this method, and she, Yan Qi, also knew this method, which could only mean that she had also directly or indirectly contacted the person who created this method, if Yan Qi could provide real clues, maybe she could find this person who created this method.

"It's from old books. Yan Qi could only answer again and again, she really couldn't help whether she could catch the accomplice, after all, she couldn't be sure whether the accomplice was her fellow countryman or a local genius, she never dared to despise the creative power of the ancients, such as sulfuric acid, wasn't it discovered and refined by the Taoist priests of alchemy as early as the Tang Dynasty or even earlier.

Huh?

Yan Qi was about to speak again, but he heard Yan Zike's "oh" and got up to leave.

…… Are you angry? Don't play with the child's temper.